Meanwhile, melt butter in large saucepan on medium heat. Add onions; cook 3 min. or until crisp-tender, stirring frequently. Add flour; cook and stir 1 min. Gradually add milk; cook 5 min., stirring constantly. Simmer on medium-low heat 10 min. or until slightly thickened, stirring frequently. Remove from heat. Add 1-1/2 cups cheese; stir until melted.
Drain pasta. Add to cheese sauce; stir until evenly coated. Spoon into 2-qt. casserole sprayed with cooking spray; top with remaining cheese, bacon and crushed chips.
Bake 20 to 25 min. or until heated through.
Calories From Fat
% Daily Value*
Total Fat 26g
Saturated Fat 13g
Trans Fat 0g
Total Carbohydrates 31g
Dietary Fibers 4g
* Percent Daily Values are based on a 2,000 calorie diet.
6 servings, 1 cup each
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.